Apparatus for molding concrete floor slabs



Dec. 11, 1951 M. GONZALEZ FLORES 2,578,057

APPARATUS FOR MOLDING CONCRETE FLOOR SLABS Filed Oct. 21, 1948 INVENTQRMimi/de l GFloree Patented Dec. 11, 1951 OFFICE APPARATUS. FOR MOLDING,GQNGRETE FLOOR SLABS.

Manuel Gonzalez Flores, Mexico City, Mexico Application October-21,1948, Serial No. 55,662 In. Mexico November 1,1947

1 Claim.

This invention relates to a new system for stripping and re-erectingforms for the pouring of horizontal or inclined elements of concreteupon a structural framework, including vertical columns, when theplacing program is from the top downwards, i. e. beginning from an upperfloor downwards to the foundation, or from any intermediate floordownwards, using in all successive pours the same form.

This system requires the use for each column bay of a form made up of amain section and several adjustable forms joined to the main sectionalong its perimeter or several edges, and either separable or boltedtogether by means of hinges. The form thus made up is placed where theconcrete is to be poured, and is held in place by means of tie rodswhich are supported by the existing framework.

The construction details herein described give the system advantagesthat cannot be obtained with methods which are already known, saidadvantages are the following:

With this system if the forms are to be built at the top, it isnecessary to build and remove only once the temporary working floor forthe construction of said forms. If these forms are built in the lowerpart of the building, it is not necessary to have any temporary workingfloor for their construction. It is possible to strip and re-erect theforms for a series of superposed or vertically aligned areas using theuppermost hardened concrete structure initially poured as the support,and, therefore, eliminating the necessity for temporary form supportingstructures at each level.

In the drawing, Figure l is a fragmentary vertical section of a skeletonframework for a building having a form structure constructed accordingto an embodiment of this invention mounted thereon.

Figure 2 is a fragmentary vertical section of the form element showingthe device in operative position relative to a frame element.

Figure 3 is a perspective view of one of the tapered guide members forthe tie rods.

Referring to the drawing, the numeral I designates a plurality ofupright frame members for a building, and the numerals H and I2 desig--nate crossed horizontal beam members which are secured to the uprightsl0 in a conventional manner. A concrete form element, generallyindicated at M, is supported relative to the frame structure and to thehorizontal members H and [2 by means of plurality of tie rods l5. Thetie rods [5 are operatively associated with a lowerin means l6 carriedby a supporting frame structure [1. The lowering means [6 and supportingstructure I! is constructed substantially in the form of a winch, or thelike, and is of conventional construction. Frame structure I! is seatedon horizontally disposed beams or trusses it, which are extended betweenpairs of horizontal beams 12 as shown in Figure 1.

The form member 14 is constructed in the form of a flat horizontalsurface l9, which is built up from a plurality of planks or boards whichare secured to transversely disposed beams 2!) disposed below thesurface I9. The form M has disposed adjacent each end thereof pairs ofV-shaped guides, generally designated 2|, which are disposed adjacentthe marginal edges of the form" M in a position whereby the outerdownwardly convergent side 22 is adapted in the event the form shouldshift laterally to engage a horizontal beam number l2. The outer side 22is braced by an upperly divergent inner side 23, and the two sides 22and 23 form the V-shaped guide 2|. The tie rod l5, which is of anextensible characteristic having connectors 24 for connecting adjoiningtie rod members, extends through the form l4 and is fixed below the formM by fastening means 25.

In Figure 1, the form I4 is disposed in an intermediate and inoperativeposition between floors, and it will be understood that the form I 4when in operative position is raised or elevated to substantially theposition shown in Figure 2. In order to provide a means whereby the sameform l4 may be used for succeeding floors in the formation of concreteslabs, I have provided a tapered or frusto-conical shield 26 which isengaged about the tie rod l5 and initially is seated on the upper sideof the form surface ill.

The shield 26 is, as shown in Figure 3, formed of complementary shieldsections 21 and 28 which are detachably secured together by straps 29.The shield 26 is formed with a central bore 39 through which the tie rodI5 loosely engages. After the slab of concrete has firmly set, theforml4 may be dropped downwardly away from the lower side of the concreteslab, and at this time the shields 26, which have their larger endsuppermost, will remain in the concrete slab. These shields may beforcibly moved upwardly and out of the concrete slab and then reassembled on the lowered form for further use in the pouring of a lower slabof concrete.

The concrete form structure hereinbefore described will provide aneconomical form structure which can be re-used after a slab has set 3without taking the form apart. After one conorete slab has set, thisslab may be used as a support for the lowering means and the tie rods l5may be extended through the tapered openings formed in the slab by theshields 26.

I claim:

Form means for pouring concrete in a structure having parallel spacedapart horizontal and vertical frame members, comprising a form memberloosely engagin between adjacent ones of said vertical frame members, abeam mounted upon upper horizontal frame members, extensible tie rodsdepending from said beam and connected to said form member, taperedshields disposed about said tie rods at the lower ends thereof, saidform member being provided with inwardly inclined guide members on thebottom surface thereof for preventing obstruction of downward movementthereof by the horizontal frame members, and means for lowering saidform members.

MANUEL GONZALEZ F.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 949,093 Sherwood Feb. 15, 19101,066,436 Peltzer Jul 1, 1913 1,701,113 Keller Feb. 5, 1929 FOREIGNPATENTS Number Country Date 108,249 Australia Aug. 10, 1939

